# Relationship history for MSHA mine 0203522

Current hierarchy: **Terry Lynn Clark Schoonover; Kevin George Schoonover → Onyx crushing AZ LLC → Plant 4**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Kevin George Schoonover et al → Plant 4; 2023-11-08 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Onyx crushing AZ LLC → Plant 4; 2024-12-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kevin George Schoonover et al → Onyx crushing AZ LLC; 2024-12-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Terry Lynn Clark Schoonover et al → Onyx crushing AZ LLC; 2024-12-09 to current/open; source msha-controller-operator-history